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Mount Tehama
Mount Tehama (also called Brokeoff Volcano or Brokeoff Mountain) is an eroded Extinct volcano, extinct andesite, andesitic stratovolcano in the Cascade Volcanoes, Cascade Volcanic Arc and the Cascade Range in Northern California. Part of the Geology of the Lassen volcanic area, Lassen volcanic area, its tallest remnant, Brokeoff Mountain, is itself the second highest peak in Lassen Volcanic National Park and connects to the park's highest point, Lassen Peak. Located on the border of Tehama County, California, Tehama County and Shasta County, California, Shasta County, Brokeoff's peak is the highest point in the former. The hikers that summit this mountain each year are treated to "exceptional" views of Lassen Peak, the Central Valley of California, and many of the park's other features. On clear days, Mount Shasta can also be seen in the distance. Brokeoff Volcano was active from 590,000 to 387,000 years ago, during which period it erupted numerous flows with compositions ranging ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shasta County, California
Shasta County (), officially the County of Shasta, is a County (United States), county located in the Northern California, northern portion of the U.S. state of California. Its population is 182,155 as of the 2020 census, up from 177,223 from the 2010 census. The county seat is Redding, California, Redding. The county borders Modoc County, California, Modoc County, Lassen County, California, Lassen County, Siskiyou County, California, Siskiyou County, Plumas County, California, Plumas County, Tehama County, California, Tehama County and Trinity County, California, Trinity County. Shasta County comprises the Redding, California metropolitan statistical area. The county occupies the northern reaches of the Sacramento Valley, with portions extending into the southern reaches of the Cascade Range. Points of interest in Shasta County include Shasta Lake, Lassen Peak, and the Sundial Bridge. Mount Shasta is in adjacent Siskiyou County to the north. History Shasta County was one of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lassen Peak
Lassen Peak ( ), commonly referred to as Mount Lassen, is a lava dome volcano in Lassen Volcanic National Park in Northern California. Located in the Shasta Cascade region above the northern Sacramento Valley, it is the southernmost active volcano in the Cascade Range of the Western United States, and part of the Cascade Volcanic Arc stretching from southwestern British Columbia to Northern California. It supports many flora and fauna among its diverse habitats, which reach high elevations and are subject to frequent snowfall. Lassen Peak has a volume of , making it one of the largest lava domes on Earth. The volcano arose from the former northern flank of now-eroded Mount Tehama about 27,000 years ago, from a series of eruptions over the course of a few years. The mountain has been significantly eroded by glaciers over the last 25,000 years, and is now covered in talus deposits. On May 22, 1915, a powerful explosive eruption at Lassen Peak devastated nearby areas, and spr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subduction
Subduction is a geological process in which the oceanic lithosphere and some continental lithosphere is recycled into the Earth's mantle at the convergent boundaries between tectonic plates. Where one tectonic plate converges with a second plate, the heavier plate dives beneath the other and sinks into the mantle. A region where this process occurs is known as a subduction zone, and its surface expression is known as an arc-trench complex. The process of subduction has created most of the Earth's continental crust. Rates of subduction are typically measured in centimeters per year, with rates of convergence as high as 11 cm/year. Subduction is possible because the cold and rigid oceanic lithosphere is slightly denser than the underlying asthenosphere, the hot, ductile layer in the upper mantle. Once initiated, stable subduction is driven mostly by the negative buoyancy of the dense subducting lithosphere. The down-going slab sinks into the mantle largely under its own ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ring Of Fire
The Ring of Fire (also known as the Pacific Ring of Fire, the Rim of Fire, the Girdle of Fire or the Circum-Pacific belt) is a tectonic belt of volcanoes and earthquakes. It is about long and up to about wide, and surrounds most of the Pacific Ocean. The Ring of Fire contains between 750 and 915 active or dormant volcanoes, around two-thirds of the world total. The exact number of volcanoes within the Ring of Fire depends on which regions are included. About 90% of the world's earthquakes, including most of its largest, occur within the belt. The Ring of Fire is not a single geological structure. It was created by the subduction of different tectonic plates at convergent boundaries around the Pacific Ocean. These include: the Antarctic, Nazca and Cocos plates subducting beneath the South American plate; the Pacific and Juan de Fuca plates beneath the North American plate; the Philippine plate beneath the Eurasian plate; and a complex boundary between the Pacific a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct Volcano
A volcano is commonly defined as a vent or fissure in the Crust (geology), crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and volcanic gas, gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where list of tectonic plates, tectonic plates are divergent boundary, diverging or convergent boundary, converging, and because most of Earth's plate boundaries are underwater, most volcanoes are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes resulting from divergent tectonic activity are usually non-explosive whereas those resulting from convergent tectonic activity cause violent eruptions."Mid-ocean ridge tectonics, volcanism and geomorphology." Geology 26, no. 455 (2001): 458. https://macdonald.faculty.geol.ucsb.edu/papers/Macd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodore Roosevelt
Theodore Roosevelt Jr. (October 27, 1858 – January 6, 1919), also known as Teddy or T.R., was the 26th president of the United States, serving from 1901 to 1909. Roosevelt previously was involved in New York (state), New York politics, including serving as the state's List of governors of New York, 33rd governor for two years. He served as the 25th Vice President of the United States, vice president under President William McKinley for six months in 1901, assuming the presidency after Assassination of William McKinley, McKinley's assassination. As president, Roosevelt emerged as a leader of the History of the Republican Party (United States), Republican Party and became a driving force for United States antitrust law, anti-trust and Progressive Era policies. A sickly child with debilitating asthma, Roosevelt overcame health problems through The Strenuous Life, a strenuous lifestyle. He was homeschooled and began a lifelong naturalist avocation before attending Harvard Colleg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Monument (United States)
In the United States, a national monument is a protected area that can be created from any land owned or controlled by the federal government by proclamation of the president of the United States or an act of Congress. National monuments protect a wide variety of natural and historic resources, including sites of geologic, marine, archaeological, and cultural importance. The Antiquities Act of 1906 gives presidents the power to proclaim national monuments by executive action. In contrast, national parks in the U.S. must be created by Congressional legislation. Some national monuments were first created by presidential action and later designated as national parks by congressional approval. The 138 national monuments are managed by several federal agencies: the National Park Service, United States Forest Service, United States Fish and Wildlife Service, the Bureau of Land Management, and the National Oceanic and Atmospheric Administration (in the case of marine national monu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacramento Valley
The Sacramento Valley is the area of the Central Valley of the U.S. state of California that lies north of the Sacramento–San Joaquin River Delta and is drained by the Sacramento River. It encompasses all or parts of ten Northern California counties. Although many areas of the Sacramento Valley are rural, it contains several urban areas, including the state capital, Sacramento. Comparatively water-rich relative to the other segment of the Central Valley to the south, the San Joaquin Valley, there are slight differences in the crops typically grown in the Sacramento Valley. Much wetter winters (averaging between of annual precipitation in the nearby foothills) and an extensive system of irrigation canals allows for the economic viability of water-thirsty crops such as rice and '' Juglans hindsii''-rootstock walnuts. Since 2010, statewide droughts in California (combined with unprecedented summer heat) have strained both the Sacramento Valley's and the Sacramento metropolitan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nobles Emigrant Trail
The Nobles Emigrant Trail, also known as the Fort Kearney, South Pass and Honey Lake Wagon Road, is a trail in California that was used by emigrant parties from the east as a shortened route to northern California. It was pioneered in 1851 by William Nobles, who discovered an easy shortcut between the Applegate Trail in Nevada and the Lassen Trail in California. The trail was extensively used until the 1870s, when it was superseded by railroads. Discovery and establishment The main trail to California in the 1840s was the California Trail, which followed the Humboldt River in Nevada, then the Truckee River, and over the Donner Pass in California. A northern variation was pioneered by the Applegate brothers in 1846, using a more northerly route that connected with destinations in Oregon. Peter Lassen established a variant route that passed Lassen Peak on the way to the Sacramento area. Lassen scouted the area of Honey Lake with William H. Nobles for a legendary "Gold Lake", b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wagon Trains
''Wagon Train'' is an American Westerns on television, Western television series that aired for eight seasons, first on the NBC television network (1957–1962) and then on American Broadcasting Company, ABC (1962–1965). ''Wagon Train'' debuted on September 18, 1957, and reached the top of the Nielsen ratings. It is the fictional adventure story of a large westbound Conestoga wagons, wagon train through the American frontier from Missouri to California. Its format attracted famous guest stars for each episode, appearing as travelers or residents of the settlements whom the regular cast encountered. The show initially starred film actor Ward Bond as the wagon master (replaced after his death in 1960 by John McIntire) and Robert Horton (actor), Robert Horton as the scout (eventually replaced by Robert Fuller (actor), Robert Fuller). The series was inspired by the 1950 film ''Wagon Master'' and the 1930 early widescreen film ''The Big Trail'', both featuring Bond. The series in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
